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How hard is it to replace the ecu (computer) on my 90 celica? I am mechanically ignorant.

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What controls the ground for the injectors on a 1992 toyota celica. I have sent out the computer and they sent it back saying it was ok. I have power to the injectors but no ground on # 1 & 3.

The ground goes into the computer to be internally grounded. Maybe bad wires in your harness somewhere.

#1 is a red wire, goes to ecu pin # 12 of the larger (26 pin) dark gray connector of ecu.

#3 ground wire is a yellow wire, enters ecu on pin 25 of same dark gray connector- Connector D.

Gave you that so you could check continuity of the wires. Hope you have an ohmmeter, a multi-meter. Good luck.

Jun 18, 2015 | 1992 Toyota Celica

1 Answer

I recieved Code 12 from diagnosis

For 83-86 Camry, 87 corolla, 84-87 pickups and 4-runner: Code 12 = knock sensor or circuit (distributor or circuit on Cressida, Supra, and Celica 3S-GE)

87-90 Camry, all other models 88-90: Code 12 = Rpm signal/no NE or G signal to ECU within several seconds after engine is cranked.

All models from 1991 on: Code 12 = Rpm signal No "Ne" signal to the ECM within several seconds after the engine is cranked. No "G" signal to the ECM two times in Succession when engine speed is between 500 rpm and 4000 rpm.

Feb 08, 2011 | Toyota 4Runner Cars & Trucks

1 Answer

My 00 celica won't start. The battery went completely dead because I had the radio left on overnight. Now it will turn over but won't start. I have been told by a mechanic that the ECU is blown in it, so...

doubt if it is the ECU
check the ecu fuse in the engine bay cluster
and the starter relay are ok

check for spark at the plugs
and fuel pump is working
the fuel pump has a relay

ECUs dont go bad due to flat battery
if you jump started the toyota without putting the jumping earth lead to your toyota motor direct as an earth ecus may blow the fuse


Apr 28, 2017 | 2000 Toyota Celica

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I have a 91 talon tsi awd. the kid i got it off did some stupid thing with the stock wiring harness. now the car has a problem starting but after start up the car is a beast. i feel like the car isn't...

Since this is 91, its likely that the original engine has been replaced, and various other mods have been done. Essentially you need ot figure out what the previous owner did, and either fix it or ignore it.

A common "trick" with the wiring is to change the MAF sensor (on the air filter can) around to get more fuel at high boost. Pull off the 8 pin connector and check for bent pins. Check for 5V (NOT +12v) on one of the pins, as this is the MAF sensor supply voltage.

Other issues are the coolant temp sensor (2 pin sensor with black? connector on the themostat housing) connection.

If the temp sensor is not properly connected, or the wrong sensor for the engine, it will be hard to start esspecially when cold.

If possible, verify what ECU is fitted. The 90-91 ECU has slightly different pin connections to the 92-94.

You may also have fuel pump relay issues. This is the large can in the center console, near the ECU.
Open the ECU and check the large electrolytic capacitors for leaks. Its a common problem, and there various people around who will replace them before they destroy the ECU board.

Check all the vacuum hoses for cracks and leaks. Check the hoses for the intercooler and up to the throttle body.

Have a look at for more information.

Dec 22, 2010 | 1991 Eagle Talon

2 Answers

90 celica gt4

check cam sensor

Jul 22, 2009 | 1990 Toyota Celica

2 Answers

Engine cranks but won't turn over. Almost like its out of gas but isn't.

Sounds like you need to have your fuel pump serviced.

Jun 13, 2009 | 1990 Toyota Celica

1 Answer

90 celica

check your catalytic might be clogged.

Mar 09, 2009 | Toyota Celica Cars & Trucks

1 Answer

Starter replacement

Its not that hard the starter is easily accesible. Its right in front of the engine.

Jul 29, 2008 | 1992 Toyota Celica

1 Answer

~ quote??

May not be an issue. I owned a 93 lexus sc400 for 5 years and the whole time I had it till the car was distroyed in an accedent in april this year the lifters clicked from 146,000 to 212,000 miles. never caused a single problem. I was told by many mechanics to ignore it. just a thought

Jul 22, 2008 | 1993 Toyota Celica

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